Fault-tolerant control method and system for open-phase fault of dual three-phase permanent magnet synchronous motor

Abstract

The invention discloses a fault-tolerant control method and system for open-phase faults of dual three-phase permanent magnet synchronous motors, and belongs to the technical field of motor control. For a dual three-phase permanent magnet synchronous motor after a single-phase open circuit, the residual five-phase current is decomposed into a torque plane and a harmonic plane, and for the control of the torque plane current, a dead-beat current prediction controller introducing an extended state observer is adopted to replace a traditional PI controller. And outputting voltage through an SPWM modulation method to realize fault-tolerant control of the dual three-phase permanent magnet synchronous motor. According to the method, the ESO observer is applied to the open-phase fault working condition of the dual three-phase permanent magnet synchronous motor, complex cross coupling terms which are difficult to process by other control strategies can be ingeniously avoided, in the ESO, the coupling terms are considered as a part of the total disturbance of the system to be observed, then compensation is carried out in a voltage prediction equation, and the control strategy of the open-phase fault of the dual three-phase permanent magnet synchronous motor is optimized. Compared with traditional fault-tolerant control, the calculation amount and the algorithm complexity are greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of motor control, and more specifically relates to a method and system for fault-tolerant control of a phase-loss fault of a double-three-phase permanent-magnet synchronous motor. Background technique [0002] In recent years, high power and high reliability have become one of the main development directions of the AC motor variable frequency drive system in the future, and one of the more popular solutions to improve the power and reliability of AC variable frequency speed regulation is to use multi-phase motors. Among them, the most commonly used is the double-three-phase permanent magnet synchronous motor structure with two sets of windings with an electrical angle difference of 30°. For this type of motor current loop control strategy, the traditional PI control strategy is mostly used in both normal and fault conditions. In addition to the inherent problem that PI control cannot take into account the fa...

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Problems solved by technology

[0004] Aiming at the above defects or improvement needs of the prior art, the present invention provides a fault-tolerant control method and system for phase loss faults of dual-three-phase permanent magnet synchronous motors, the purpose of which is to solve the technical problem of complex fault-tolerant control algorithms for multi-phase motors

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